Pipe slip joint



Jan.. 1, 1935. J. R. JAHN 1,985,899

PIPE SLIP JOINT Fi led Aug. 3, 1932 lNVENTOR ATTORNEYS Muted 1,1935 t1,985,899

UNITED STATES PATENT OFFICE PIPE SLIP JOINT John a. Jahn, Berkeley,Calif., assignor a, Callfornia Corrugated Culvert 00., Berkeley, Calif.,

a co poration of California Application August 3, 1932, Serial No.827,327

2 Claims. (Cl. 285-163) The present invention relates toquick-detachminate at the end of the pipe, but is extended to able orslip joints for pipe, and is especially suitform a joint member 9,having a throat portion able for joining the sections of movable pipeused which in longitudinal section is smoothly arched for irrigation.inwardly, terminating in a flared free end 10.

6 The obj cts of the invention are to provide a The outside diameter ofthe extension or joint simple an inexpensive joint which is easily and mb 9 i such as to Pe mit t t enter freely, quickly assembled and takenapart, which is aufor the greater portion of its length, into the endtomatically progressively tightened by increasthe p p section 3, d thedia et o its ing fluid pressure, which permits some angularity free endalthough greater t a t Of t 10 between pipe sections, which offerspractically central is p ab y su ently less than 10 no resistance to theflow of water through the the inside diameter Of the section 3 to permita pipe, and in which the only part subject to wear few degrees ofangularity twe th axes of is a cheap and easily replaced gasket. Afurther the two Sections; object is to provide a joint which can beapplied A resilient ring gasket 11, preferably rubber,

as an tt t t plain or straight ended cylinof circular or oval crosssection, is adapted to 15 .drical pipes or tubes to adapt for quick cou-I'eSt upon the constricted throat portion or conpling into a continuouspressure tight fluid tinuously curved wedging surface constituting theduit. These and other objects and advantages Outer p p y of t e t ns on9 before the of the invention will be apparent from the foltwo P p tiare assembled, Occupying a D lowing specification, which should be readwith sition as indicated in dotted lines in Fig. 1. It 20 tunderstanding t t changes within t scope should be noted that theoutside or greater diof t appended claims may be made in t g ameter ofthe gasket is equal to or greater than construction and amngement of tseveral the inside diameter of the straight cylindrical pipe parts,without departing from the spirit of the Section 3 and that thetelescoping 0f e djainvention cent ends, 9 into 3, causes the gasket tobe rolled 25 In certain forms of irrigation practice, it is cusunder theOuter edge Q section 3 n up and tomary t use a long line of pipe lyingupon th upon the expanded portion or wedging surface surface of thground, and having a plurality 1 of section 9, to the position shown infull lines, suitably spaced water outlets. When the area thereby Wedgingtightly between the ac of reached by said outlets has been sufilcientlyirrisaid Seetiehs- 30 gated, the entire pipe line is shifted to a newlo- Any suitable means are P i r ldin cation. This necessitatesseparating the joints t tWO sections together, h as ap d ails of th limoving th sections separately, and or lugs 12 and 13 securedrespectively to the colre-assembling them in the new location. My lar 5and sleeve 7, and freely swinging links 14 improved slip joint is welladapted for this use, p m n n ly engaging the lugs 12 a dap 3:3 andresults in considerable saving, both in first ed to be l pp v th s 1 Rmovable cost of the pipe and in the labor required to move pins 1 m y bepassed through h l s 1 to it. My joint, however, is not limited to suchuse, 1001! the links 14 in Position, as o but may be employed in anysituation and for It w ll be s n at y j t may be ass m- 4 any purposefor which its construction renders it bled n m Water tight ply y pu hingthe 40 uitabl end, of one pipe section into the end. of the Referencewill be made to the accompanying Oth r and l n t l n 14 n that it maydrawing, which illustrates a preferred embodibe k n p r by reversing thep Th ment of the invention, and in which shape of the extension 9, withits smoothly arched Fig.1 is a longitudinal section of my improvedcentral portion or throat of reduced diameter 45 joint, taken on theline 1-1 of Fig. 2. and its flaring ends, not only tightens the jointFig. 2 is an elevation of the same, by wedging the ring gasket when thepipe sections In the drawing, the reference numerals 3 and are pushedtogether. and causes a ske t0 4 designate two sections of pipe to bejoined. A be pr s ve d d te a t fluid prescylindrical reinforcing collar5 is permanently sure in the pipe is increased, but retains the 50secured, preferably by welding as indicated at ring gasket upon theextension when the joint is 6, exteriorly upon the end of the section 3.A taken apart, so that said gasket need not be sleeve member '1 issimilarly secured, as by weldhandled separately and is not likely to belost. ing at 8, upon the end of the section 4. The Attention isespecially directed to the fact that,

sleeve member 7, unlike the collar 5, does not teralthough the throatportion 9 is constricted to 55 a diameter materially less than that ofthe straight pipe sections 3 and 4, nevertheless its smoothly archedform produces a Venturi eil'ect which oifers practically no obstructionor resistance to the flow of water through the pipe.

The Joint is simple and inexpensive to construct, has no parts subjectto wear except the cheap and easily replaced ring gasket, and can beeasily cleaned merely by washing or even wiping oil. This latter is ofparticular advantage in irrigation work, when the pipe sections are laidupon loose earth. Furthermore, the joint permits some angularity betweensections of the pipe line to allow it to conform to irregularities inthe ground surface, and such angularity does not impair its tightness.

Obviously, the extension 9 may be integral with the pipe section 4,instead of being a separate member secured thereto, as shown. The joint,therefore, lends itself admirably to coupling together sections of thewell known circumferentially corrugated pipe, in which the last or endcorrugation forms a seat for the gasket.

On the other hand, my joint is also well adapted for use with plaincylindrical pipe sections of uniform diameter, it being necessary onlyto attach the collar 5 and sleeve 7 to the respective ends of such pipesections to enable them to be joined together, detachably, into acontinuous conduit. In other words, the end portions of the pipesections need not be specially formed, and one of said end portions,vim-that of the sec tion 3, becomes one member of the joint itself.

I claim:-

1. A pipe joint comprising inner and outer telescoping pipe sections,the insertable end of one section having oppositely extending graduallyinclined wedging surfaces of substantial ting axial frictional rollingmovement of said gasket along the wedging surface for sealing contactwith the outer pipe section in any position of the gasket on saidwedging surface.

2. A pipe joint comprising inner and outer telescoping pipe sections,the insertable end of one section having a uniform continuous curvaturelongitudinally of its length to provide an uninterrupted wedging surfaceof varying diameters and having a less diameter at its extremity thanthe internal diameter of the radially spaced portion of the outer pipesection to permit of relative angular movement of said pipe sections,and an axially movable resilient ring gasket carried by said wedgingsurface and engageable with the inner surface of the outer of said pipesections, the uniform longitudinal curvature of said wedging surfaceinsuring against displacement of said gasket out of a planeperpendicular to the axis of the pipe section and permitting axialfrictional rolling movement of said gasket along the wedging surface foruniform sealing contact with the outer pipe section in any position ofthe gasket on said wedging surface.

JOHN R. JAHN.

